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Try http://www.unh.edu/p2/biodiesel/article_alge.html
The USDA claims 3.2 units for 1 unit input for biodiesel from soybeans.
The report does not show how this is determined. UNH claims higher
production from alga; again not well supported. In either case about
10% ethanol or methanol is needed for the final biodiesel production.
Growing soyabeans to produce biodiesel would require all of the
available arable land; as a minimum, it would probably require more.
Using arable land to produce fuel is dumb, within a very few years all
arable land - and more - will be needed for food production. Alga
production on non arable land may be feasible but only if
ethanol/methanol can be produced using non arable land.
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